sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; color ranges from white, tan, to translucent; vitreous luster; trigonal crystal system; conchoidal fracture; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; color ranges from white, tan, to translucent; vitreous luster; trigonal crystal system; conchoidal fracture; specific gravity of 2.65.
Formation & geological history
Formed through the weathering and water-transport erosion of larger quartz-bearing rocks, typically rounded by river or ocean action over thousands to millions of years.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacture, glassmaking, and by rock collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to chemical weathering.
Field identification & locations
Found easily in riverbeds, beaches, and alluvial deposits worldwide. Identified by its high hardness (scratches glass) and smooth, rounded water-worn shape.
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Quartz pebble
Silicon dioxide (SiO2)
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